Tunable dual-band circuit resonator and working method thereof

Abstract

The invention relates to the technical field of resonant circuits, in particular to a tunable dual-band circuit resonator and a working method thereof. The resonator comprises N resonance modules, and topological structures adopted by the N resonance modules are circuit structures of nonlinear tripolymer topological models; the circuit structure of the tripolymer topology model comprises three coupling nodes which are used for changing the resonant frequency according to the change of the voltage amplitude of the input end and the two resonant frequencies corresponding to the voltage amplitude in a set voltage range, so that the dual-band tuning is realized, the overall power consumption and the additionally introduced signal interference are remarkably reduced, and the dual-band tuning is realized. And the cost is also greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of resonant circuits, and in particular to a tunable dual-band circuit resonator and a working method thereof. Background Art

[0002] Topological insulators are a new type of electronic material that has attracted much attention due to their unique physical properties. They are insulators inside, but conductive on the surface. This property stems from the topological protection of the material, which makes its surface conductivity extremely robust and unaffected by material defects and impurities.

[0003] Generally, the design of dual-band resonators is to combine two or more resonators in parallel or series in the same circuit, and the two resonators respond to the signal separately to form a dual-band resonant structure, so that it can work simultaneously or separately in two independent frequency ranges. Due to the existence of multiple resonators, the crosstalk between the resonators affects the independence of the frequency bands and reduces the working performance of the system; at the same time, since its tuning function is achieved by adjusting the external voltage, the introduction of the external voltage requires additional control circuits, etc., which increases the complexity of the system design and the power consumption of the operation, and reduces the reliability and stability of the system operation.

[0004] The existing technology mainly realizes dual-band tunability through series or parallel resonators. This existing technology solution has some disadvantages. First, since the two resonators are directly and simply connected, there may be crosstalk, which causes the working frequency band of the resonator to drift and cannot work at the frequency specified in the design. Additional harmonics or cross-frequency components may also appear in the spectrum. If the two resonator frequency bands are adjacent, when they work in the two frequency bands at the same time, coupling causes insufficient frequency separation, affecting the independence of the dual frequency bands. Secondly, under this technical solution, tuning is achieved by introducing a common cathode varactor diode, a variable inductor or other adjustable components, and supplemented by an external voltage. By applying a bias voltage, the frequency of each resonator is dynamically adjusted. This method introduces an external voltage, which not only increases the circuit power consumption and introduces uncontrollable signal interference, but also significantly reduces the stability and reliability of the circuit. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a tunable dual-band circuit resonator and a working method thereof in view of the deficiencies in the above-mentioned prior art, so as to solve the technical problems of current crosstalk and dependence on external sources in traditional tunable resonant dual-band circuit resonators.

[0006] The objective of the present invention is achieved by the following technical solutions: In the first aspect, the present invention provides a tunable dual-band circuit resonator, including N resonance modules, N>1, and the topological structures adopted by the N resonance modules are all circuit structures of nonlinear trimer topological models; the circuit structure of the trimer topological model includes three coupling nodes, which are used to change the resonance frequency according to changing the voltage amplitude of the input end, and when the voltage amplitude of the input end is adjusted within a set voltage range, there are two resonance frequencies corresponding to the voltage amplitude at the same time, thereby realizing dual-band tuning.

[0007] As a further improvement of the present invention, the first coupling node and the third coupling node in the resonance module are respectively used to connect adjacent resonance modules, and the first coupling node and the third coupling node are respectively connected to the adjacent resonance modules through second-type coupling elements; the first coupling node and the second coupling node are connected through the first-type coupling element; the second coupling node and the third coupling node are connected through the first-type coupling element; the first resonance circuit unit or the third resonance circuit unit in the resonance module located on the edge side is grounded through the second-type coupling element.

[0008] As a further improvement of the present invention, the resonance module also includes a first resonance circuit unit, a second resonance circuit unit and a third resonance circuit unit; the first resonance circuit unit is arranged at a first coupling node, the second resonance circuit unit is arranged at a second coupling node, and the third resonance circuit unit is arranged at a third coupling node.

[0009] As a further improvement of the present invention, the first type of coupling element includes a second coupling capacitor and a third coupling capacitor; the second type of coupling element includes a first coupling capacitor and a fourth coupling capacitor; the first resonant circuit unit is used to connect the first coupling capacitor and the second coupling capacitor through a first coupling node; the second resonant circuit unit is used to connect the second coupling capacitor and the third coupling capacitor through a second coupling node; and the third resonant circuit unit is used to connect the third coupling capacitor and the fourth coupling capacitor through a third coupling node.

[0010] As a further improvement of the present invention, the first resonant circuit unit and the third resonant circuit unit are provided with the same first LC resonator, and nonlinear frequency adjustment elements are connected in parallel at both ends of the first LC resonator; the second resonant circuit unit is provided with a second LC resonator, and nonlinear frequency adjustment elements are connected in parallel at both ends of the second LC resonator.

[0011] As a further improvement of the present invention, the first LC resonator includes a first grounding capacitor and a grounding inductor connected in parallel; the second LC resonator includes a second grounding capacitor and a grounding inductor connected in parallel.

[0012] As a further improvement of the present invention, the first coupling capacitor and the fourth coupling capacitor both use capacitors with a first capacitance value, and the second coupling capacitor and the third coupling capacitor both use capacitors with a second capacitance value; the first capacitance value is smaller than the second capacitance value.

[0013] As a further improvement of the present invention, the nonlinear frequency adjustment element is a common cathode varactor diode, and the common cathode varactor diode is used to introduce nonlinearity; the capacitance of the common cathode varactor diode changes with the modulus amplitude of the alternating voltage.

[0014] As a further improvement of the present invention, the first coupling capacitor, the second coupling capacitor, the third coupling capacitor and the fourth coupling capacitor in the resonance module are all passive capacitors; the first grounding capacitor and the second grounding capacitor are both passive capacitors; and the grounding inductor is a passive inductor.

[0015] In a second aspect, the present invention provides a working method of a tunable dual-band circuit resonator, based on the above-mentioned tunable dual-band circuit resonator, comprising: When the first type of coupling element and the second type of coupling element do not introduce errors, when the input end signal acts on the first coupling node, by adjusting the input voltage amplitude to a set voltage range, two resonant states corresponding to the resonant frequencies and corresponding voltages will exist simultaneously in the internal circuit of the resonator, forming a dual frequency band; The two frequency bands can be tuned by adjusting the voltage in the resonance module on the edge side.

[0016] The beneficial effects of the present invention are as follows: the tunable dual-band circuit resonator provided by the present invention has dual-band working capability. By innovatively adopting a nonlinear trimer model, the resonator of the present invention can work in two independent frequency bands. The dual-band operation is realized by utilizing the topological edge states in the two band gaps. Compared with the traditional dual-band implementation method, the crosstalk and frequency drift are reduced, and the stability of the resonator operation is enhanced.

[0017] Furthermore, since the topological edge states of the trimer topological insulator are robust, the impact of device errors is fundamentally reduced, thereby improving the robustness of the resonator.

[0018] Furthermore, the structure introduces a nonlinear effect by connecting a common cathode varactor in parallel. This enables the circuit resonator to be tunable, breaking the limitation of a single resonant frequency. At the same time, since the operating frequency of the resonator is related to the input signal, tuning can be achieved by adjusting the voltage amplitude. Compared with the traditional solution of introducing an external voltage and a common cathode varactor, it reduces possible interference and high power consumption, allowing the resonator to adjust its operating frequency according to different application requirements, greatly expanding its application range and flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural diagram of a tunable dual-band circuit resonator based on a nonlinear trimer topological insulator in an embodiment of the present invention.

[0021] FIG. 2( a ) is a diagram showing the relationship between the input terminal resonant frequency and the voltage in an embodiment of the present invention.

[0022] FIG2( b ) is a voltage distribution diagram of the first topological edge state in an embodiment of the present invention.

[0023] FIG2( c ) is a voltage distribution diagram of a second topological edge state in an embodiment of the present invention.

[0024] Figure 3 is a capacitance and voltage curve diagram of a common cathode varactor diode in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose and technical solution of the present invention clearer and easier to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, wherein the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0027] Example 1 like Figure 1 -As shown in FIG2 , this embodiment provides a tunable dual-band circuit resonator, which can overcome the problems of circuit crosstalk and dependence on external sources in traditional tunable dual-band circuit resonators, thereby adapting to working conditions with higher requirements and higher precision.

[0028] The tunable dual-band circuit resonator includes N resonance modules, wherein N>1, and the topological structures adopted by the N resonance modules are all circuit structures of nonlinear trimer topological models. The circuit structure of the trimer topological model includes three coupling nodes, which are used to change the resonance frequency according to the voltage amplitude at the input end, and when the voltage amplitude at the input end is adjusted within the set voltage range, there are two resonance frequencies corresponding to the voltage amplitude at the same time, thereby realizing dual-band tuning. Among them, N in this embodiment is 8. Among them, the dual-band range in the set voltage range in this embodiment is 0-0.055V. And the single-band range is between 0.055-0.35V.

[0029] Among them, the resonance module ( Figure 1 The first coupling node ( Figure 1 The red dots in the figure), the third coupling node ( Figure 1 The purple dots in the figure are used to connect adjacent resonant modules. The first coupling node and the third coupling node are connected through the second type of coupling element ( Figure 1 C2 in the figure) is connected to the adjacent resonant module; the first coupling node and the second coupling node ( Figure 1 The blue dots in the figure are connected by the first type of coupling element; the second coupling node and the third coupling node are connected by the first type of coupling element; the first resonant circuit unit or the third resonant circuit unit in the resonance module on the edge side is grounded through the second type of coupling element. The three coupling nodes represent the three periodic nodes in the nonlinear trimer topological insulator circuit. All three coupling nodes are connected to the ground through the resonator.

[0030] The resonance module also includes a first resonance circuit unit, a second resonance circuit unit and a third resonance circuit unit; the first resonance circuit unit is arranged at a first coupling node, the second resonance circuit unit is arranged at a second coupling node, and the third resonance circuit unit is arranged at a third coupling node.

[0031] In addition, the other ends of the first resonant circuit unit, the second resonant circuit unit and the third resonant circuit unit are grounded.

[0032] In this embodiment, the first type of coupling element includes a second coupling capacitor and a third coupling capacitor; the second type of coupling element includes a first coupling capacitor and a fourth coupling capacitor. Further, the first resonant circuit unit is used to connect the first coupling capacitor and the second coupling capacitor through a first coupling node; the second resonant circuit unit is used to connect the second coupling capacitor and the third coupling capacitor through a second coupling node; the third resonant circuit unit is used to connect the third coupling capacitor and the fourth coupling capacitor through a third coupling node.

[0033] Furthermore, the first resonant circuit unit and the third resonant circuit unit are provided with the same first LC resonator. A nonlinear frequency adjustment element is provided in parallel at both ends of the first LC resonator. Specifically, the first LC resonator includes a first grounding capacitor C provided in parallel. A and ground inductance L g .

[0034] The second resonant circuit unit is provided with a second LC resonator, and a frequency adjustment element is connected in parallel at both ends of the second LC resonator. The second LC resonator includes a second grounding capacitor C arranged in parallel B and ground inductance L g .

[0035] The first coupling capacitor and the fourth coupling capacitor both use capacitors with a first capacitance value, and the second coupling capacitor and the third coupling capacitor both use capacitors with a second capacitance value; the first capacitance value is less than the second capacitance value. The first coupling capacitor, the second coupling capacitor, the third coupling capacitor, and the fourth coupling capacitor used in this embodiment are all passive capacitors.

[0036] The nonlinear frequency adjustment element is a common cathode varactor diode, which is used to introduce nonlinearity; the capacitance of the common cathode varactor diode changes with the modulus amplitude of the alternating voltage. The common cathode varactor diode is a common cathode diode.

[0037] In this embodiment, the capacitance of the common cathode varactor diode under different applied voltage values ​​is measured in an experiment, and then a mathematical model is performed on the common cathode varactor diode, and finally a fitting curve of capacitance and AC voltage value is obtained, and the formula is expressed as follows:

[0038] in, is the capacitance value when the applied voltage is 0, and is a constant, is the amplitude of the voltage applied across the common cathode varactor diode. After fitting, the capacitance-voltage curve of the common cathode varactor diode is as follows: Figure 3 shown.

[0039] As another implementation, the number of the common cathode varactor diodes in this embodiment can be multiple, and multiple common cathode varactor diodes are arranged in parallel on both sides of the LC resonator, thereby expanding the adjustment range of the resonant frequency and achieving a larger capacitance variation range.

[0040] In this embodiment, a tunable dual-band circuit resonator based on a nonlinear trimer topological insulator is provided. The circuit is composed of passive elements. When the first coupling element and the second coupling element do not introduce errors, the resonant frequency at the input end is related to the voltage. When the voltage increases, the resonant frequency increases accordingly, and two frequencies and voltages exist simultaneously within a specific voltage range, as shown in FIG2 (a), which indicates the dual-band and tunable working characteristics of the circuit resonator. The circuit distribution corresponding to the two topological edge states of the nonlinear trimer topological insulator used is shown in FIG2 (b) and FIG2 (c). This embodiment is based on the topological edge state of the nonlinear trimer topological insulator. At the corresponding resonant frequency, the voltage in the circuit is mainly distributed at the two leftmost nodes of the circuit, i.e., the resonant circuit unit connected to the first coupling node and the second coupling node.

[0041] In this embodiment, the ground inductance L in the circuit of the tunable dual-band circuit resonator is g is 15 microhenries, the first type coupling element C1 is 180 pF, the second type coupling element C2 is 560 pF, and the first grounding capacitor C A The second grounding capacitor C is 380 pF. B is 760 pF. In this resonator, the common cathode varactor diode C v The number of is 2.

[0042] The topological edge states in the upper and lower band gaps in the trimer model are used to realize a tunable dual-band circuit resonator, overcoming the problems of circuit crosstalk and dependence on external sources in traditional tunable dual-band circuit resonators, so as to adapt to working conditions with higher requirements and higher precision. For the crosstalk existing in traditional resonators, since the two frequency bands used in the target circuit are located in the band gap of the trimer model circuit and belong to the topological edge states, it has strong robustness, and the two states are independent of each other and do not interfere with each other. At the same time, due to the nonlinearity introduced by the common cathode varactor diode, the operating frequency of the edge state will change with the magnitude of the voltage amplitude, and finally the effect of tuning is achieved by the change of the operating frequency with the voltage amplitude. Since the working properties of this resonator are analyzed from the perspective of the circuit as a whole when constructing its structure, and it is protected by the inherent topological protection of the topological insulator, its operating frequency is more stable. At the same time, all devices used in the circuit structure are passive devices. Compared with the common cathode varactor diode that relies on external bias in the traditional solution, this structure significantly reduces the overall power consumption and the additional signal interference, and also greatly reduces the cost.

[0043] Example 2 This embodiment provides a working method of a tunable dual-band circuit resonator, based on the tunable dual-band circuit resonator in the above embodiment 1, including: When the first type of coupling element and the second type of coupling element do not introduce errors, when the input end signal acts on the first coupling node, by adjusting the input voltage amplitude to a set voltage range (for example, 0-0.055V), two resonant states corresponding to the resonant frequencies and corresponding voltages will exist simultaneously in the internal circuit of the resonator, forming a dual frequency band; The two frequency bands can be tuned by adjusting the voltage in the resonance module on the edge side.

[0044] When the amplitude of the resonant voltage increases from 0V to 0.055V, the resonant frequency of the first topological edge state increases from 410.9kHz to 412.8kHz, and the resonant frequency of the second topological edge state increases from 419.5kHz to 421.4kHz. When the voltage amplitude continues to increase, the first topological edge state disappears, and the circuit becomes a single-band tunable resonator. When the voltage amplitude increases from 0.055V to 0.35V, the resonant frequency of the second topological edge state increases from 421.4kHz to 428.6kHz.

Claims

1. A tunable dual-band circuit resonator, characterized in that: It includes N resonance modules, N>1, and the topological structures adopted by the N resonance modules are all circuit structures of nonlinear trimer topological models; the circuit structure of the trimer topological model includes three coupling nodes, which are used to change the resonance frequency according to the voltage amplitude of the input end, and when the voltage amplitude of the input end is adjusted within the set voltage range, there are two resonance frequencies corresponding to the voltage amplitude at the same time, realizing dual-band tuning.

2. The tunable dual-band circuit resonator according to claim 1, characterized in that: The first coupling node and the third coupling node in the resonance module are respectively used to connect adjacent resonance modules, and the first coupling node and the third coupling node are respectively connected to the adjacent resonance modules through the second type of coupling elements; the first coupling node and the second coupling node are connected through the first type of coupling element; the second coupling node and the third coupling node are connected through the first type of coupling element; the first resonance circuit unit or the third resonance circuit unit in the resonance module located on the edge side is grounded through the second type of coupling element.

3. The tunable dual-band circuit resonator according to claim 2, characterized in that: The resonance module also includes a first resonance circuit unit, a second resonance circuit unit and a third resonance circuit unit; the first resonance circuit unit is arranged at a first coupling node, the second resonance circuit unit is arranged at a second coupling node, and the third resonance circuit unit is arranged at a third coupling node.

4. The tunable dual-band circuit resonator according to claim 3, characterized in that: The first type of coupling element includes a second coupling capacitor and a third coupling capacitor; the second type of coupling element includes a first coupling capacitor and a fourth coupling capacitor; The first resonant circuit unit is used to connect the first coupling capacitor and the second coupling capacitor through the first coupling node; The second resonant circuit unit is used to connect the second coupling capacitor and the third coupling capacitor through the second coupling node; The third resonance circuit unit is used to connect the third coupling capacitor and the fourth coupling capacitor through a third coupling node.

5. The tunable dual-band circuit resonator according to claim 3, characterized in that: The first resonant circuit unit and the third resonant circuit unit are provided with the same first LC resonator, and nonlinear frequency adjustment elements are connected in parallel at both ends of the first LC resonator; the second resonant circuit unit is provided with a second LC resonator, and nonlinear frequency adjustment elements are connected in parallel at both ends of the second LC resonator.

6. The tunable dual-band circuit resonator according to claim 5, characterized in that: The first LC resonator includes a first grounding capacitor and a grounding inductor connected in parallel; the second LC resonator includes a second grounding capacitor and a grounding inductor connected in parallel.

7. The tunable dual-band circuit resonator according to claim 4, characterized in that: The first coupling capacitor and the fourth coupling capacitor both use capacitors with a first capacitance value, and the second coupling capacitor and the third coupling capacitor both use capacitors with a second capacitance value; the first capacitance value is smaller than the second capacitance value.

8. The tunable dual-band circuit resonator according to claim 5, characterized in that: The nonlinear frequency adjustment element is a common cathode varactor diode, and the common cathode varactor diode is used to introduce nonlinearity; the capacitance of the common cathode varactor diode changes with the modulus amplitude of the alternating voltage.

9. The tunable dual-band circuit resonator according to any one of claims 4 to 6, characterized in that: The first coupling capacitor, the second coupling capacitor, the third coupling capacitor and the fourth coupling capacitor in the resonance module are all passive capacitors; the first grounding capacitor and the second grounding capacitor are both passive capacitors; and the grounding inductor is a passive inductor.

10. A method for operating a tunable dual-band circuit resonator, based on the tunable dual-band circuit resonator according to any one of claims 1 to 9, characterized in that: include: When the first type of coupling element and the second type of coupling element do not introduce errors, when the input end signal acts on the first coupling node, by adjusting the input voltage amplitude to a set voltage range, two resonant states corresponding to the resonant frequencies and corresponding voltages will exist simultaneously in the internal circuit of the resonator, forming a dual frequency band; The two frequency bands can be tuned by adjusting the voltage in the resonance module on the edge side.

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